Pipe-wrench.



PATIENTED OCT. 16, 1906.

' M. G. BWER.

- PIPE WRENCH. AIPLIQA'IION FILED AUG. 23, 1905.

. WITNESSES- I INVENTORH YUQNITED s'rnrns PATENT, oFnroE;

JMALCOLM e. wen, or DETROIT, MICHIGAN. 1

' PIPE-WRENCH;

H No. 833,51

v specification of Letters Patent. Application filed Aug1st 23'190 Serial 1a. 275,343.

Patentedfldct; 16 1906.

- being had to the accompanying drawing,

which forms a part of this specification.

This invention relates to pipe-wrenches.

It has for its object an improved quick- .adjustment pipe-wrench.

In the drawing the figure shows the fixed the sliding jaw in secaw in elevation and tion.

1 indicates the fixed jaw w1th a'tang or handle 2, provided with a screw-threaded.

cut rack 3. The sliding jaw 4 engages over the tang 2, which projects through openings 5 and 6 in the back ofthe sliding jaw 4. Of these the opening 6 is very slightly larger than the tang and the opening 5 is considerably larger than the tang, so that the forward end 41 ofthe sliding jaw can rock .slightly on the point 7 as a pivot, to which it is held by the face 8. The rocking movement is limited by the extent of the opening 5.

At the front end of the sliding jaw 4 is a 'bit 9, the rear face of which is curved and engages with a curved face 10 at the front of the sliding jaw, the face 10, however, being at the bottom of arecess within which the bit 9 is received. The bit 9 is held from escaping from the recess by pin 1 1 that engages through a curved slot 12 in the b1t.' The sliding jaw is held adjustably in place by a pivoted and swiveled screw 13, the front end of which is pivoted to the rear of the jaw 4 in a recess or cavity into which pivot-knuckle 17 at the front of the screw extends. On that side of the screw which is opposite the tan 2 is a concealed spring 14, that bears against a shoulder 15 on the knuckle of the screw and normally tends to hold the screw in engagement with the rack 3. The threads of the screw are broad and are knurled or milled to aflord a suflicient grip for the fingers to turn the screw. The screw itself is swiveled t0. the pivot-knuckle 17 and is readily revoluble to drive the sliding jaw along the tang. v The knuckle 17 enga es in a cavity at the rear ofv the jaw 4 and 1s ltself provided with a seat for the.reception of the neck 18 of the screw. The periphery of the knuckle =17, 0r at least that part of the periphery of the knuckle 17 which lies immediatelyadjacent to the tang, the pivot 16 and the tang with a bearing engagement: against the tang. The knuckle closely confines the tang between itself and the point 7 of the strap, by which this part of the sliding jaw is held to the tang. Preferably the point 7 is produced by thickening the strap slightly at the middle, producinga slight clearance at each side ofthe point between the strap and the tang 2. When the screw is in position to drive the jaw, the knuckle bears against the tang, holding the tang between itself and the point 7, which lies directly across froin the bearing-point of the knuckle. The neck 18 of the screw en- .gag'es in the seat 19 and is provided with an annular groove 20, in which engages a short holding-screw 21, which allows the screw 13' to turn in its bearings independent of the knuckle 17, whereas it swings on the pin 16 with the knucklel7. I

In action when the jaws are engaged over a pipe the sliding bit 9 assumes a position somewhat more nearly parallel to the bit 92 than that shown in-the drawing and holds 'tenaciously on the pipe so long as the proper twisting motion for turning the pipe is continued or so long as pressure toward such turning motion is continued. As soon, however, as the reverse pressure is given to the wrench the sliding jaw rocks to bring the back 51 into engagement with the tang and loosens the hold of the jaw on the pipe. The rack part with-which the screw engages is located on the tang beyond the place where a pipe can touch it under any ordinary circumstances and is not liable to be marred by the use of the tool. 1 I

What I claim is v j 1. In a pipe-wrench, in combination with a fixed jaw and a tang therefor, a sliding jaw is curved and engages between-v provided'with an embracing band at one end thereof adapted to engage against the back of the tang and with a pivoted knuckle having a curved bearing-surface engaging the tang opposite thereto, an adjusting-screw swiveled onsaidpivoted knuckle,flan embracing band at the gripping end of said jaw loosely surrounding the tang whereby there isfreedom of rocking movement of the-jaw w1th respect to the tang, substantially as described.

2. In a pipe-wrench, in combination with 'g gaging said rack, pivotal connections bea fixed jaw and a tang therefor provided with a screw-threaded cut rack, a screw engaging said rack, pivotal connections between'the screw and the jaw, a curved bearing interposed between the pivot and the tang andsecond band engaging with clearance around the band, substantially as described.

3. In a pipe-wrench, in combination with a fixed jaw and a tang therefor provided withra screw-threaded'cut rack, a screw entween the screw and the jaw, a bearing engaging around the pivot and against the tang, a band secured to, the jaw'and embracing the tang and provided with a curved engaging face opposite the said interposed bearing, a second band distanced from the first and near the gripping end of said jaw, the second band engaging with clearance around the tang, and a movable bit forming the gripping part of said jaw, substantially as described.

In testimony whereof I sign this specification in the presence of two Witnesses;

. MALCOLM G. EWER.

Witnesses: CHARLES F. BURTON,

MAY E. Korr'r. 

